Huygens' Dipole for Polarization-Controlled Nanoscale Light Routing

Abstract

Structured illumination allows for satisfying the first Kerker condition of in-phase perpendicular electric and magnetic dipole moments in any isotropic scatterer that supports electric and magnetic dipolar resonances. The induced Huygens' dipole may be utilized for unidirectional coupling to waveguide modes that propagate transverse to the excitation beam. We study two configurations of a Huygens' dipole -- longitudinal electric and transverse magnetic dipole moments or vice versa. We experimentally show that only the radially polarized emission of the first and azimuthally polarized emission of the second configuration are directional in the far-field. This polarization selectivity implies that directional excitation of either TM or TE waveguide modes is possible. Applying this concept to a single nanoantenna excited with structured light, we are able to experimentally achieve scattering directivities of around 23 dB and 18 dB in TM and TE modes, respectively. This strong directivity paves the way for tunable polarization-controlled nanoscale light routing and applications in optical metrology, localization microscopy and on-chip optical devices.

arXiv comment5pages, 2 figures

References in corpus (15)

• Optical spin-to-orbital angular momentum conversion in inhomogeneous anisotropic media
• High-efficiency light-wave control with all-dielectric optical Huygens' metasurfaces
• Directional visible light scattering by silicon nanoparticles
• Generalized Kerker Effects in Nanophotonics and Meta-Optics
• Demonstration of zero optical backscattering from single nanoparticles
• Hypergeometric-Gaussian Modes
• Angle-Suppressed Scattering and Optical Forces on Submicron Dielectric Particles
• Janus and Huygens' dipolar sources for near-field directionality
• Polarization Controlled Directional Scattering for Nanoscopic Position Sensing
• Transverse Kerker Scattering for Angstrom Localization of Nanoparticles
• On the experimental investigation of the electric and magnetic response of a single nano-structure
• Strongly directional scattering from dielectric nanowires
• The magnetic and electric transverse spin density of spatially confined light
• Adding a spin to Kerker's condition: arbitrary scattering direction tuning of nano-antennas with designed excitation
• Weak measurement of elliptical dipole moments by C point splitting

Cited by in corpus (7)

• Scattering asymmetry and second Kerker condition
• Directional Dipole Dice Enabled by Anisotropic Chirality
• Vectorial vortex generation and phase singularities upon Brewster reflection
• Momentum-space geometric structure of helical evanescent waves and its implications on near-field directionality
• Mimicking Chiral Light-Matter Interaction
• Towards Polarization-based Excitation Tailoring for Extended Raman Spectroscopy
• Unidirectional Transverse Scattering in Acoustic Dimers